[PyQt] Python 3 import error

[Hans-Peter Jansen]

On Thursday 02 December 2010, 18:31:04 Thorsten Kampe wrote:
> * Hans-Peter Jansen (Thu, 2 Dec 2010 15:47:28 +0100)
>
> > On Thursday 02 December 2010, 14:25:21 Thorsten Kampe wrote:
> > > Okay, if I omit the ".toByteArray()", then the application starts
> > > with Python 3 - but it doesn't work with Python 2 anymore:
> > >
> > > self.restoreGeometry(settings.value('Geometry'))
> > > TypeError: QWidget.restoreGeometry(QByteArray): argument 1 has
> > > unexpected type 'QVariant'
> > >
> > > Is there a way around that or do I simply have to query the
> > > Python version inside the script? Or put in a try "without
> > > toByteArray()" if exception, try with "toByteArray()"?!
> >
> > Add this before your _first_ PyQt4 import:
> >
> > # This is only needed for Python v2 but is harmless for Python v3.
> > import sip
> > sip.setapi('QVariant', 2)
>
> That works great, thanks.
>
> > > The - hopefully - last problem with the porting to Python 3:
> > > Everything seems to work fine, except closing the application
> > > through the menu or toolbar (Alt+F4 works fine):
> > >
> > > Traceback (most recent call last):
> > >   File "my_application-new.pyw", line 32, in
> > > on_actionE_xit_triggered settings.setValue('Geometry',
> > > QtCore.QVariant(self.saveGeometry())) TypeError:
> > > PyQt4.QtCore.QVariant represents a mapped type and cannot be
> > > instantiated
> > >
> > > this refers to
> > > def on_actionE_xit_triggered(self):
> > >     settings = QtCore.QSettings()
> > >     settings.setValue('Geometry',
> > > QtCore.QVariant(self.saveGeometry())) self.close()
> >
> > Please read my answer in this thread: "Sip usage problem".
>
> I did that, but I don't fully understand - especially in regard to a
> solution. How do I have to modify
> settings.setValue('Geometry', QtCore.QVariant(self.saveGeometry()))
> ...so it doesn't throw the error anymore?

Omitting it should be sufficient:

	settings.setValue('Geometry', self.saveGeometry())

Pete